1Dielectric barrier discharge low-temperature plasma exhaust gas treatment equipmentTechnical Introduction

Dielectric barrier discharge generates plasma, which has a very high density. Originally used for the decomposition and treatment of Freon and Halong substances, it is a scientific research project established by the country to study and protect the Earth's ozone layer. Extending to the treatment of industrial odors, peculiar odors, and toxic and harmful gases. This technology is energy-saving, environmentally friendly, and has a wide range of applications. Almost all odors and odors generated in chemical production processes can be treated, and it has a good decomposition effect on dioxins.

2、 Technical principle of dielectric barrier discharge low-temperature plasma exhaust gas treatment equipment

Low temperature plasma is the fourth state of matter after solid, liquid, and gas. When the applied voltage reaches the discharge voltage of the gas, the gas is broken down, producing a mixture including electrons, various ions, atoms, and free radicals. During the discharge process, although the electron temperature is high, the temperature of heavy particles is low, and the entire system exhibits a low-temperature state, hence it is called low-temperature plasma. Low temperature plasma degradation of pollutants is the process of utilizing high-energy electrons, free radicals, and other active particles to interact with pollutants in exhaust gas, causing pollutant molecules to decompose in a short period of time and undergo various subsequent reactions to achieve the goal of pollutant degradation. (Note: Compared to high-temperature plasma, low-temperature plasma operates at room temperature.)

The medium blocking plasma reaction zone is rich in substances such as high-energy electrons, ions, free radicals, and excited state molecules. The pollutants in the exhaust gas can react with these high-energy substances, causing them to decompose in a short period of time and undergo various subsequent reactions to achieve the goal of degrading pollutants.

The basic process of plasma removal of pollutants

Process 1: Direct bombardment of high-energy electrons

Process 2: Oxidation of O atoms or ozone

O2+e→2O

Process 3: Oxidation of OH radicals

H2O+e→OH+H

H2O+O→2OH

H+O2→OH+O

Process 4: Reaction of Molecular Fragments and Oxygen

3、 Technical characteristics of low-temperature plasma exhaust gas treatment equipment using dielectric barrier discharge

The complete set of equipment for industrial waste gas treatment using medium barrier plasma has laid the foundation for clean chemical production and is a technological revolution in modern chemical industry production.

The medium barrier plasma technology for industrial waste gas treatment has the following characteristics:

The application of medium barrier low-temperature plasma technology in the treatment of odorous gases has the advantages of good treatment effect, low operating cost, no secondary pollution, stable operation, easy operation and management, and immediate use.

① Dielectric barrier low-temperature plasma discharge generates high electron energy, high low-temperature plasma density, and can interact with almost all odorous gas molecules;

② The medium barrier low-temperature plasma technology has a fast reaction speed, and the gas passes through the reaction zone at a speed of 3-15 meters per second, which achieves a good processing effect;

③ The gas passage section is entirely made of corrosion-resistant materials such as ceramics, quartz, and stainless steel, without direct contact between electricity and exhaust gas, fundamentally solving the corrosion problem of low-temperature plasma technology equipment;

④ The medium barrier low-temperature plasma host is a complete industrial waste gas treatment device, equipped with an air purification tower in front, which can effectively remove dust and moisture from the waste gas and is easy to operate;

⑤ The automation level is high, and the equipment starts and stops very quickly. It can be turned on as needed. For some chemical production discontinuities, it can be turned on during production and stopped during non production intervals, saving a lot of energy;

⑥ The operating cost is relatively low, saving 5-8 times the operating cost compared to commonly used regenerative combustion furnaces RTO. The operating cost per cubic meter of gas is only 0.3-0.9 cents. Some high concentration exhaust gases can be diluted with air and treated with medium blocking low-temperature plasma technology;

⑦ Widely applicable, basically unaffected by temperature and pollutant components, it has a good decomposition effect on the odor concentration of foul odors. The removal rate of foul odors reaches 80-98%, and the odor concentration of the treated gas meets national standards;

⑧ The medium barrier low-temperature plasma technology for treating industrial waste gas is not a water washing technology, but a direct breakdown and bombardment of pollutants by high-energy plasma, causing molecular chain breakage, rather than the transfer of pollutants.

4、 Technical process of low-temperature plasma exhaust gas treatment equipment using dielectric barrier discharge

After the odor gas is collected from the gas collection system, a portion of the exhaust gas needs to be pre treated to remove water and enter the plasma reaction zone. Under the action of high-energy electrons, the odor molecules are excited, and the chemical bonds between charged particles or molecules are broken. At the same time, water and oxygen in the air also produce strong oxidizing substances such as OH radicals and reactive oxygen species under high-energy electron bombardment. These strong oxidizing substances will react with the odor molecules to decompose, thereby promoting the elimination of odor. The purified gas is discharged at high altitude through the exhaust pipe.